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ed (east) and black-crested (west) titmice, and the indigo (east) and Lazuli (west) buntings.
East-west patterns of differentiation are commonly observed in widespread birds, plants and mammals. They are thought to have originated during the formation of the Great Plains by the most recent glacial period 10,000 years ago, which separated large woodland populations of organisms into eastern and western halves.
Continued separation ap
95.3%